more portable python shebangs (#5816)
This is useful on systems like NixOS, where python3 is not in
/usr/bin/python3 as well as for people using alternative ways to
install python such as virtualenv/pyenv.
diff --git a/test/create-sys-script.py b/test/create-sys-script.py
index 4b7abd2..402b4f8 100755
--- a/test/create-sys-script.py
+++ b/test/create-sys-script.py
@@ -1,6 +1,6 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
-OUTFILE_HEADER = """#!/usr/bin/python3
+OUTFILE_HEADER = """#!/usr/bin/env python3
#
# create-sys-script.py
#